Heads and Cam
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Joined: Jul 2021
Posts: 68
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From: Michigan
Heads and Cam
After going back and fourth in my head I was originally going to go with a 383 build but I think for now I might go with cam and heads, was wondering what combos people have had success with? Also will i need to do my injectors as well? I plan to port the intake manifold and hope one day for the new renegade to come around.
Burning Brakes
Joined: Sep 2017
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After going back and fourth in my head I was originally going to go with a 383 build but I think for now I might go with cam and heads, was wondering what combos people have had success with? Also will i need to do my injectors as well? I plan to port the intake manifold and hope one day for the new renegade to come around.
as far as porting intake manifold. using flow bench. port matching head side shows gains and tapering entrance shows a gains and enlarging middle of port shows gains as long as its smaller than tapered entrance. welding a rod around the opening and tapering the roof more. doing all of that gets 215 cfm with TB's and head. little under 200 without welded rod on top. I used a early model intake with no balancing holes. flows more.
hogging out port will flow more, but there are problems. In 2 spots the water jacket goes up into the dividers, the dividers walls get very thin and if ya grind threw and make a hole in the wall, the flow goes down.
someone with patience could use a sonic tester to avoid going breaking through. I did get 222cfm, but I broke into water jacket. If I wanted to max out stock intake. I would use a sonic checker and port entrance as big as possible and than port the rest of the runner but staying smaller than entrance, 222 cfm. need renegade to go beyond that, in my opinion. I went conservative. can only say what the flow bench results are at this point.
chicken scratch sketch of port I'm using.
